Just to chime in again, because I feel various different issues have been conflated in this thread. One can debate about how a search function should behave exactly, whether it should match strings anywhere or only at the beginning of a word, etc, but that is NOT the kind of issue I personally felt any particular problem with the bunq search at the moment and not the reason I started this thread.
Rather, it was because I discovered there are actual specific transactions that are getting missed out by the search for no apparent reason, certainly no reason relating to the search terms used. I gave the example of searching for bunq invoices, which occur on the 8th of each month: two specific ones from my 21-month history with bunq are missing from search results: Sep 2017 and Nov 2017. The transactions exist, if I scroll back I can find them, but NO MATTER HOW I search for them, by the word “invoice”, or by their invoice number, whatever, there seems to be no way to get them to show up. It is as though they are missing from the search database/index itself. Another example is my “XS4ALL” monthly invoices, one of them is missing too. And several other random transactions that I have happened to notice by trial and error. This is the bug that needs to be fixed.